/* 初始化所有标签的内边距 */
*{
	margin: 0;
	padding: 0;
}
.box{
	width: 200px;
	height: 230px;
	border: 1px solid black;
	font-size: 36px;
	text-align: center;
	/* float: left;	 */		/*  左浮动  */
	/* float: right; */		/*  右浮动  */
}
.bufu{
	width: 300px;
	height: 300px;
	background-color: pink;
}
.clear{
	clear: both;
}
.fu{
	/* overflow:hidden */
}
/* 3.添加after伪元素 */!!!!!!
/* after:在.....之后 */
.clearfix::after{
	content: ;  /* 内容为空 */
	display: block;
	height: 0;
	clear: both;
	visibility: hidden;
}
/* 4.添加双伪元素 */
.clearfix::after,.clearfix::before{
	content: "";
	display: table;
}
.clearfix::after{
	clear: both;
}